the latest on nigella lawson, back on the stand today at the fraud trial of her former assista assistants. Lama hasan is right outside the court in london with the story. Reporter: Appearing confident and fiery in the courtroom, it was the celebrity chef's chance to hit back. This morning, she told the court that she's, quote, not proud of taking drugs. But that I would rather be honest than ashamed. Not bullied with lies. On wednesday, lawson made some explosive admissions. Saying she had used cocaine a total of seven times. And, quote, smoked the odd joint. Nigella lawson is insisting she does not have a drug problem. Explaining to the jury, quote, the idea that I'm a drug addict or habitual user of cocaine is absolutely ridiculous. Adding, I didn't have a drug problem. I had a life problem. Slamming her former husband, multimillionaire media mogul, charles saatchi, who she refers to as mr. Saatchi. The last time she used cocaine was over three years ago. I felt, how can I put this, subjected to intimate terrorism by mr. Saatchi. I felt so totally isolated. In fear and unhappy. My ice cream is so simple. Reporter: The 53-year-old tv co and author is giving evidence in the trial of her two former assistants. Elisabetta and francesca grillo, who have pleaded not guilty of defrauding her and her ex-husband of a million dollars. She testified in confiding in one of the sisters that saatchi would shout and swear at her at home. Today, she also testified about these shocking images, taken this summer. Insisting, quote, mr. Saatchi was not examining me for cocaine. That was a story he made up when she wouldn't clear his name. While nigella lawson is defiantly denying those claims made by her former husband, charles saatchi today, saying, it was not true he was getting cocaine out of my nose and I was completely off my head for ten years. And nigella is due to finish giving evidence later today. Lama, thanks. Dan abrams back for more on this. You were talking about this yesterday. You said this trial could hinge on whether or not the jury believes the allegations of drug use. And she was forced to admit something. The issue isn't drug use, it's drug abuse. She could have used drugs. And that doesn't change the fact of this particular case. The issue is, was she abusing drugs so badly to the fact that she wouldn't have remembered giving permission or that things were so out of control. Let's keep the focus here. This is a fraud trial. This is about whether they're misusing credit cards. You can't buy illegal drugs with credit cards. How directly relevant is this going to be to the charges at hand? She walked that line pretty well. Yeah. I think she had to make some level of admission on that. The question is, how much weight are the jurors going to give this? This is a problem in a position like hers in cooperating with authorities in a prosecution like this. You have to say to yourself, is it worth it? But remember, these are personal assistants. So, everything becomes personal. So, everything in her life, they were helping run everything. So, it all becomes relevant to some degree. She ends up paying a price. Impossible position she's in here. Thanks very much. To the tangled relationship

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